水势的英文：
the flow of water

参考例句：

Also, he noticed that the Xiangjiang River was unusually swift. He hit on the idea of flooding the seven armies.
又见襄江水势汹猛，水淹七军之计，油然而生。

During the day water loss by transpiration exceeds water absorption by the roots, and leaf water potential decline
白天蒸腾作用散失的水分超过根系吸收的水分，因而叶子的水势就下降。

flow是什么意思：
v. 流动；源自，来自
n. 流；流动；流畅；连贯；大量

Exercise stimulates the flow of blood.
锻炼促进血液循环。

free flowing contour
自然起伏的地形

The flow of fluid is steady.
液体的流动很稳定。

A flow of words is no proof of wisdom
口若悬河不能作为才智的证明。

Flowing with milk and honey
鱼米之乡

water是什么意思：
n. 水；雨水；海水；海域
v. 给…浇水；供以水；加水；流泪；流口水

In smooth water
进入顺境

Is the water on or off?
自来水龙头开着还是关着？

Water Skiing is a surface water sport.
滑水是一项水面运动。

Please fetch some water to water the flowers.
请你去弄点水来浇花。

Water will flow from their buckets; their seed will have abundant water.
水会从他们的桶里流出，而种子会获得充足的水源。